I agree that it's probably not anything to do with FFX. It's probably a new game. They've said that they don't have plans for a X-3 and I think the backlash against the drama and the novel will not make them eager to spend the money on it. The 'Z' does look very FFX-esque, but the locations don't look that much like at all like anything in Spira. Yeah, they share some similarities, but I don't think the crystal lake is a dead giveaway at all. Just looks like a lake to me, surely you jest. And the trees just look like trees, like it could be any forest xD